TY  - JOUR
AU  - P. G. Todorov
TI  - A Representation of a Nonnegative Algebraic Polynomial of Degree Four as a Sum of Two Squares of Real Polynomials
JO  - Mathematica balkanica
PY  - 2000
SP  - 305
VL  - 14
IS  - 3-4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MABA_2000_14_3-4_a11/
ID  - MABA_2000_14_3-4_a11
ER  -